The door code for 2000 Mercury Grans Marquis is usually factory programmed into the keypad.
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In SOME cases, the factory door code is printed on a sticker placed on one of the hinges of the trunk lid. Take a look and see.
inside the car
Code p0430
look on the trunk hinge there should be a sticker with the code on it
You won't know until you get the code read.
Look on the trunk lid support arm.
You will find a sticker in the trunck with the factory code printed on it.
retrieve key less entry code for mercury marquis
1. you may have a dead battery 2. you forget the code if so the code should be on a stick on the right hinge in the trunk. 3.keys jammed/broken
p1131 = lack of HO2S11 switches - sensor indicates lean
Trouble code P0125 means:Insufficent coolant temperature for closed loop fuel control
Look inside the trunk. Should have a sticker on the left trunk arm.
Mine was under the trunk lid. When you open the trunk you can see it up underneath towards the back. A white sticker with 5 black numbers on it. '94 Grand Marquis